Figure 39. Capacitive load response at Vcc = 3.3 V with

260 kHz RC filter

Figure 40. Capacitive load response at Vcc = 3.3 V with

260 kHz RC filter and Rl = 10 kΩ

Special care must be also taken on the value of the added external capacitor. Indeed, if this is chosen with an

excessive value and the serial resistance with a too small value, there is a risk of instability on the output of the

TSC213.

•

Driving large capacitive Cload

Increasing the load capacitance produces gain peaking in the frequency response, with overshoot and

ringing in the step response.

Figure 41 shows the serial resistors that must be added to the output, to make a system stable.

Figure 42 shows that the stability of the TSC213 can be improved when a load of 10k is added on the

output in order to source a small current.

Figure 41. Stability criteria with a serial resistor at

Vcc = 5 V

Figure 42. Stability criteria with a serial resistor and a

Rload = 10 kΩ at Vcc = 5 V

TSC210, TSC211, TSC212, TSC213, TSC214, TSC215

Application information

DS13237 - Rev 7

page 21/38